tation, is encreased by being confined and rebounded, and in its going off by the Straightness or Length of the Pipe, and Turns or Checks in it, and by keeping off the Cold from condenfing the Steam, as from the Stomach, &c. When we intend to burn any Thing, we estimate what Quantity and what fort of fuel is neceffary to confume it. When we diffolve or ferment any Thing, what Quantity and Sort of Diffolvent or ferment is neceffary, what Addition of other Things is neceffary for them to work in, what previous Preparation they need, what manner they ought to be placed in, what Helps or Affiftances may be given to them, in the Operations by Motion, Impulfe, Preffure or the contraries, or if the Operation be too ftrong, what Sort, Quantity, &c. of Matter is proper to allay it, how it is to be applied, &c. The Cafe is much the fame in our Stomachs, and like Caufes have like Effects there. And we ought to eat and drink Things that will be eafily or difficultly diffolved or born off, according to the various Degrees of Exercise we are to ufe, &c.

Where there is fuch Matter as Barm in Ale, or Phlegm in the Stomach, or any other Matter of a tough fibrous Conftitution, fo that it can environ or enclose fmall

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fmall Maffes of fluids, &c. the Corpuf cles of Salt and fire, can expand the Maffes of the Fluid contained in the Phlegm, extend the Fibres of the Phlegm each Way, till it form a round Bubble whofe Sides rebound the Corpufcles, and augment their force. As foon as the Bubble is of that Size, that it is lighter than the fluid, it makes upward, and sometimes bursts in the Way, and causes an Explosion, fometimes rifes to the Top, extends vastly, and burfts there; after the fame Manner in Proportion, to the Degree of Heat, as a fmall Quantity of fluid enclosed in a Stick or Stone put into a fire is expanded, and bursts the Body which inclofes it, with a vaft force and Noife, or as Ale or other fermenting Liquors burft a close Veffel. "Tis thus Dough rifes by ferment: 'Tis thus Soap compofed of Salt and Oil moved in warm Water, raises a Lather of Bubbles. And in Proportion to the Clofenefs and Strength of the Phlegm, the Strength of the Agents within it is increased; as the force of fire is increased by the Strength and Clofenefs of the furnace; of the Barrel which enclofes fired Gunpowder; of what enclofes the Fluid in a Fire, or before the Fire, as the Skin of an Apple, the Shell of a Nut, &c,

Thus

Thus Maffes of Phlegm in a Fluid which could never be divided by the Strokes of pointed Salts or Fire, in a Guilefat, or in the Stomach, &c. are expanded till their Sides be infinitely thin, even beyond Imagination, and are rendered capable to go off in Steam, to mix equally in the fluid, &c. * Nay even the Tubes and Bladders which compofe flesh, fruit, Herbs, &c. even to the most Minute, have Juices within each of them, which when they come into the Stomach, and are pervaded by Corpufcles of fire, fubtile Salts, and Spirits, expand and diffolve the Contexture of the fibres which compose their fides. Whether the small Maffes of Fluids inclofed be ftill formed into diverfe leffer Bubbles, and they each expand by finer Juices within them, moved by the corpuscles of fire, as we fee in boiling Water, or by the Infinuation of the corpufcles of fire between the Sides of the corpufcles of the Fluid, or by the Springs

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given

It is for this Purpose, that in us and all Animals, the Juices which help in Digeftion are endued with a faponaceous Quality, as the Saliva, gaftric Humour, pancreatick Juice; both Galls, and the Juices of all the intestinal Glands; aud to this chiefly that Homogeneity of Parts in Chyle and Milk, &c. is owing, which always appears in found Animals, tho' they are prepared from Meals made up of Things naturally, abfolutely immifcible with each other.

given by corpufcles divided, or by the Extenfion of corpufcles which were bent and compreffed; it is certain that phlegmy Liquor, or a Mash, wherein fmall Maffes of fluids are fo involved or enclosed, will bubble moft, rife the quickest and highest in boiling, expand foonest, and moft in fermentation, &c. And the inclofed Juices are divided into Steam before that which encloses them, bursts. And the Stomachs and Guts that are full of Phlegm are generally moft extended.

A Brewer's Veffel, called a Back, containing thirty Barrels full of Liquor made of Malt, but more especially of Moloffus, which they call Wash, and one Barrel of Barm mixed in it, will in 24 Hours begin to ferment, and fometimes keep an Head of Barm, become warm as Milk when milked, and fo continue for a Week. And fometimes in 24 Hours make a break at one End, boil, roll, or move in the fame manner, and with near the fame Velocity as Liquor in the Salt or Allum Pans does, or this Liquor would do with a moderate fire, and will continue to roll or boil fo for 14 Days together, and will not come to any confiderable Degree of Warmnefs. They never beat in it, but let it take its own Course

till

till it cease Working, and be freed and fit to distill for Spirits. The Wash of different Sorts of Malt hiffes, and makes an extraordinary Bustle.

So if one eat and drink 30 Ounces, one Ounce of Juices fecreted out of the Glands into the Stomach, may be fufficient to ferment the whole, tho' it be no ftronger than Barm, and if the Stomach were not close, nor kept fo warm

nor

moved. Barm appears like Phlegm, and whether it be a phlegmy or thin Juice, or both that operates in the Stomach, and whether Phlegm will ferment Wort, deferves to be observed.

The force of infinitely fmall Agents is to be computed by their infinite Number, for that which will be lifted or split by one Agent, whose force is equal to a Pound Weight, can be lifted or fplit by the force of oooooo of Agents, each of whofe force is not equal to the Part of the Weight of a Grain. And alfo by their infinite Sharpness, and Smallness, for dividing the Corpufcles of Bodies, and by their infinite Quickness in repeating their Strokes.

To make this short and intelligible, 'tis neceffary to give Definitions of a few Things which are often named.

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